- All sections
- H - Electricity
- H04L - Transmission of digital information, e.g. telegraphic communication
- H04L 61/4557 - Directories for hybrid networks, e.g. including telephone numbers
Patent holdings for IPC class H04L 61/4557
Total number of patents in this class: 28
10-year publication summary
|
0
|
1
|
1
|
5
|
6
|
9
|
7
|
1
|
1
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| AT&T Intellectual Property I, L.P. | 9981 |
6 |
| Nippon Telegraph and Telephone Corporation | 15922 |
3 |
| Google LLC | 44361 |
2 |
| T-Mobile USA, Inc. | 4480 |
2 |
| Bank of America Corporation | 8341 |
1 |
| Microsoft Technology Licensing, LLC | 54399 |
1 |
| Charter Communications Operating, LLC | 1558 |
1 |
| Mitel Networks Corporation | 61 |
1 |
| Somos, Inc. | 117 |
1 |
| TextNow, Inc. | 46 |
1 |
| Tech-friends Ltd. | 2 |
1 |
| PAX S&T Co., Ltd | 3 |
1 |
| 3G Licensing S.A. | 4 |
1 |
| Acromate Co., Ltd. | 4 |
1 |
| Duzzcall (Pvt) Ltd | 2 |
1 |
| Avea Media Inc. | 2 |
1 |
| Aptiv Technologies AG | 2408 |
1 |
| VMware LLC | 6831 |
1 |
| Aist Solutions Co. | 30 |
1 |
| Other owners | 0 |